CVE-2026-98590

Verifier bypass via sign-extended socket queue mapping

Published Oct 18, 2026 · Updated Oct 18, 2026

Incorrect BPF code generation in Linux allows local users to bypass verifier value bounds through socket receive-queue mapping reads. In net/core/filter.c, bpf_sock_convert_ctx_access emits a 64-bit move of -1 for rx_queue_mapping, setting upper bits that the verifier assumes are zero. Reaching the flaw requires permission to load and run a BPF program; the published report does not establish a crash or privilege escalation.

CVSS severityUnavailable
Unscored
EPSS probability0.21%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Get started

Summary

What happened

Incorrect BPF code generation in Linux allows local users to bypass verifier value bounds through socket receive-queue mapping reads. In net/core/filter.c, bpf_sock_convert_ctx_access emits a 64-bit move of -1 for rx_queue_mapping, setting upper bits that the verifier assumes are zero. Reaching the flaw requires permission to load and run a BPF program; the published report does not establish a crash or privilege escalation.

The record

CVE
CVE-2026-98590
Published
Oct 18, 2026
Updated
Oct 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.8
  2. Affected versionversion=c3c16f2ea6d20159903cf93afbb1155f3d8348d5 <4a41d064facc3330e176ecbbf5b0026ed18a5c69
  3. Affected versionversion=c3c16f2ea6d20159903cf93afbb1155f3d8348d5 <4a4852376e3a2727ea40e61143d6d7c22bb6dfad
  4. Affected versionversion=c3c16f2ea6d20159903cf93afbb1155f3d8348d5 <70288599d1754e157df8326239316dbdf08ea33c
  5. Affected versionversion=c3c16f2ea6d20159903cf93afbb1155f3d8348d5 <84ebb991ae985149079ae9ab51b7e3ba25a9ff53
  6. Affected versionversion=c3c16f2ea6d20159903cf93afbb1155f3d8348d5 <b3f37afc7fd7c52bc2114310aff1eb24c7cd4d73
  7. Affected versionversion=c3c16f2ea6d20159903cf93afbb1155f3d8348d5 <d95dd5a6c6cd08d5ae466d3aed27b3cf59155a6c
  8. Affected versionversion=c3c16f2ea6d20159903cf93afbb1155f3d8348d5 <e3ddcf4aeb342d4de2e5761c7042270d454752de
  9. Affected versionversion=c3c16f2ea6d20159903cf93afbb1155f3d8348d5 <ea4dc96c902ccfa49dd3e4f23c443dab4a74b018

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=5.8; version=c3c16f2ea6d20159903cf93afbb1155f3d8348d5 <4a41d064facc3330e176ecbbf5b0026ed18a5c69; version=c3c16f2ea6d20159903cf93afbb1155f3d8348d5 <4a4852376e3a2727ea40e61143d6d7c22bb6dfad; version=c3c16f2ea6d20159903cf93afbb1155f3d8348d5 <70288599d1754e157df8326239316dbdf08ea33c; version=c3c16f2ea6d20159903cf93afbb1155f3d8348d5 <84ebb991ae985149079ae9ab51b7e3ba25a9ff53; version=c3c16f2ea6d20159903cf93afbb1155f3d8348d5 <b3f37afc7fd7c52bc2114310aff1eb24c7cd4d73; version=c3c16f2ea6d20159903cf93afbb1155f3d8348d5 <d95dd5a6c6cd08d5ae466d3aed27b3cf59155a6c; version=c3c16f2ea6d20159903cf93afbb1155f3d8348d5 <e3ddcf4aeb342d4de2e5761c7042270d454752de; version=c3c16f2ea6d20159903cf93afbb1155f3d8348d5 <ea4dc96c902ccfa49dd3e4f23c443dab4a74b018

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Get started to see how Hinoki identifies affected software and validates exploitability in your environment.

Get started